Abstract
The calibration of indexing table is important to ensure high accuracy and reliability in angle metrology. In this paper, we present calibrations of an indexing table and uncertainty analysis to evaluate the performance of the high precision angle comparator. The configuration of the angle comparator is explained. In the calibration, a complete closure method is applied to obtain the angle comparator’s position error and the indexing table’s angular deviation simultaneously based on the least square method. The position error of the angle comparator is evaluated to be about 0.08. The calibration result of an indexing table is compatible with that of the manufacturer and National Institute of Metrology of China within the expanded uncertainty of calibration, 0.04.
Highlights
Accurate angle measure technologies are required in various precision engineering applications, e.g., manufacturing, robotics [1,2]
At the Physikalisch-Technische Bundesanstalt (PTB) [5], high-resolution electronic autocollimators have been calibrated with the aid of the WMT 220 angle comparator to ensure their direct traceability to the SI unit of plane angle, the radian
The measurement result of the indexing table was compared with the calibration result provided by the manufacturer and the National Institute of Metrology of China (NIM)
Summary
Accurate angle measure technologies are required in various precision engineering applications, e.g., manufacturing, robotics [1,2]. Indexing tables generate accurate angular positions, and their calibrations are important to ensure high accuracy and reliability in angle metrology [3]. A multi-tooth indexing table can generate or calibrate constant angles. Since all the teeth are involved in meshing positioning, the average effect and elastic overconstrained principle of multi-tooth meshing make indexing table positioning accuracy much higher than gear disc machining accuracy. At the Physikalisch-Technische Bundesanstalt (PTB) [5], high-resolution electronic autocollimators have been calibrated with the aid of the WMT 220 angle comparator to ensure their direct traceability to the SI unit of plane angle, the radian (rad). In the calibration of the indexing table, the performance of the angle comparator was evaluated and the measurement uncertainty was analyzed
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